Die grinder



FIG. 1 is a perspective view of a die grinder embodying the ornamental design of the present invention;

FIG. 2 is a side view of the die grinder, the opposite side view being a mirror image;

FIG. 3 is a bottom view of the die grinder;

FIG. 4 is a top view of the die grinder;

FIG. 5 is a rear view of the die grinder; and,

FIG. 6 is a front view of the die grinder.

The broken line showings of FIGS. 1-6 are for illustrative purposes only and form no part of the claimed design. 

We claim the ornamental design for a die grinder, as shown and described. 